Long-term monitoring revealed that radiocesium (137Cs) deposition that fall from the canopy with litterfall was characterized by forest types, seasonal change, and canopy closure (CC). The sum of autumn and spring 137Cs deposition values divided by the sum of summer and winter tended to have higher values in the cedar forest. The angle of view α when the correlation between the CC size and litterfall amount is strongest, was 5° or less in the young cedar forest, but varied in the hardwood–pine mixed forest. This indicates the spatial distribution of 137Cs deposition has heterogeneity and homogeneity in each forest.

中文翻译：

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基于长期监测数据的阔叶松混交林和雪松人工林凋落物的空间变化和放射性铯通量

长期监测表明，随着凋落物从冠层落下的放射性铯 (137Cs) 沉积具有森林类型、季节变化和冠层关闭 (CC) 的特征。秋季和春季 137Cs 沉积值的总和除以夏季和冬季的总和在雪松林中往往具有更高的值。CC大小与凋落物量相关性最强时的视角α在雪松幼林中为5°以下，而在阔叶松混交林中则不同。这说明各森林137Cs沉积的空间分布具有异质性和同质性。